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 ###Instrução: Qual é o Men's singles que tem um Mixed doubles de kai abraham petra michalowsky?
 ###Tabelas: CREATE TABLE previous_winners (previous_winners_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Men's singles VARCHAR, Men's doubles VARCHAR, Women's doubles VARCHAR, Mixed doubles VARCHAR) CREATE TABLE medal_table (medal_table_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, Gold INT, Silver INT, Bronze INT, Total INT) CREATE TABLE episodes_and_ratings (episodes_and_ratings_id AUTO_INCREMENT PRIMARY KEY, Episode INT, First broadcast Denmark ( DR1 ) VARCHAR, Official TNS Gallup ratings INT, First broadcast UK ( BBC Four ) VARCHAR, Official BARB ratings INT) CREATE TABLE 2007_ladder (2007_ladder_id AUTO_INCREMENT PRIMARY KEY, Ballarat FL VARCHAR, Wins INT, Byes INT, Losses INT, Draws INT, Against INT) CREATE TABLE pga_tour_wins_25 (pga_tour_wins_25_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Winning score VARCHAR, Margin of victory VARCHAR, Runner(s)-up VARCHAR)  
SELECT Men's singles FROM previous_winners WHERE Mixed doubles = kai abraham petra michalowsky